Math Challenge

Jun 2019
23
0
New York
How do you add up 27 and 48 in your head?
My method
20 + 40=60, 60 +7=67, 67+8=75. What is your method?
 
Jun 2019
23
0
New York
Cool! that's how you solve that problem in your mind.

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Jun 2019
23
0
New York
For me, it goes, "sixty; sixty-seven; sixty-tenty-five," which is more-or-less the same thing.
That is interesting, how you came up with that. I hadn't thought of it that way. Brilliant!

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skeeter

Math Team
Jul 2011
3,153
1,707
Texas
$27+48 = 3 \cdot 9+3 \cdot 16 = 3(9+16) = 3(25) = 75$

it's how Ramanujan would do it ... :cool: ;) :D
 
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Jun 2019
23
0
New York
$27+48 = 3 \cdot 9+3 \cdot 16 = 3(9+16) = 3(25) = 75$



it's how Ramanujan would do it ... :cool: ;) :D
Excellent, That is another way of doing it. [emoji106]

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